Renesas M10042040054X0PSAR

Overview

M10042040054X0PSAR from Renesas is a 4Mb serial STT-MRAM non-volatile memory IC with QSPI interface, 54MHz DDR timing, industrial-plus temperature range (−40°C to +105°C), and 8-pin SOIC package. It delivers SRAM-compatible random read/write latency, zero write endurance limit, and data retention exceeding 20 years - deployed in factory automation controllers for real-time parameter logging without backup capacitors.

For engineers reviewing the M10042040054X0PSAR datasheet, M10042040054X0PSAR pinout, M10042040054X0PSAR application, or M10042040054X0PSAR equivalent, key selection criteria include its 1.71–2.0V/2.7–3.6V dual-voltage support, hardware/software write protection (WP# pin + configuration registers), 256-byte augmented storage array, JEDEC reset compliance, and compatibility with SPI Mode 0/3 in SDR and DDR configurations.

Technical Context

The M10042040054X0PSAR implements a 40nm pMTJ spin-transfer torque MRAM core with quad-SPI (QPI) interface supporting 1-4-4 command-address-data nomenclature. Its architecture includes dedicated command/address/data buffers, status/configuration registers mapped at fixed offsets (e.g., Status Register at 0x000000), and an independent 256-byte augmented storage array segmented into eight 32-byte programmable sections.

It operates in three power states - Active (read/write), Standby (CS# high), and low-power Hibernate/Deep Power Down - with guaranteed data retention and register state preservation during both. Initialization requires tPU ≥ 250 µs after VCC ramp-up, and CS# must follow VCC with external 10kΩ pull-up; no instruction execution is permitted below VCC(min).

Key Specifications

Pinout & Package

8-pin SOIC package (5.2 mm × 5.2 mm), RoHS-compliant, surface-mountable with standard reflow profile. Pin 1 marked by notch or dot; thermal pad not present.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial non-volatile memory applications.

Compared with MR25H40CMD, M10042040054X0PSAR adds DDR timing, dual-voltage operation, and augmented storage - making it superior for mixed-voltage industrial designs requiring secure, fast, and flexible parameter storage. Against S25FL116K, it trades density for deterministic latency and infinite endurance - critical for real-time logging and frequent configuration updates.

Availability

M10042040054X0PSAR is available at Aetrix Electronics and suitable for factory automation, medical diagnostics, and industrial networking applications requiring stable component supply, long-term lifecycle assurance, and guaranteed availability through 2030.

Supply support for M10042040054X0PSAR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Renesas Electronics is a global semiconductor leader specializing in microcontrollers, analog, power, and memory solutions for industrial, automotive, and infrastructure markets.

The Mxxxx204 family is designed as persistent SRAM (P-SRAM) replacements - targeting applications needing byte-addressable, high-endurance, low-latency non-volatility without flash's erase constraints or battery dependency.

FAQ

What is the maximum clock frequency supported by M10042040054X0PSAR in Double Data Rate mode?

M10042040054X0PSAR supports 54 MHz DDR operation, delivering effective throughput of ~432 Mbps in QPI 4-4-4 mode. This is confirmed in the "Features" section and Table 1 of the datasheet, where "0054" in the part number explicitly denotes the 54 MHz DDR variant. The device does not support higher DDR frequencies - attempting >54 MHz violates timing specifications and risks data corruption.

Does M10042040054X0PSAR require external hardware reset circuitry?

No, M10042040054X0PSAR does not require external reset circuitry. It supports JEDEC-standard reset command (66h) for software-initiated configuration restoration. Power-on initialization is handled internally after tPU ≥ 250 µs delay post-VCC ramp-up, provided CS# follows VCC with a 10kΩ pull-up resistor as specified in Section 7 of the datasheet.

Can the augmented storage array in M10042040054X0PSAR be used to store cryptographic keys securely?

Yes, the 256-byte augmented storage array in M10042040054X0PSAR can store cryptographic keys securely. Each of its eight 32-byte sections supports individual write protection via configuration registers, and the entire array resides outside the main memory map - preventing accidental overwrite during firmware updates. Keys remain non-volatile and retain integrity across power cycles and temperature extremes.

Is M10042040054X0PSAR pin-compatible with standard 8-pin SOIC SPI flash devices?

Yes, M10042040054X0PSAR uses the industry-standard 8-pin SOIC footprint (5.2 mm × 5.2 mm) with identical pinout (CS#, WP#/IO[2], SI/IO[0], CLK, IO[3], SO/IO[1], VCC, VSS) as common SPI NOR flash devices like Winbond W25Q80 or Cypress S25FL. This enables mechanical and layout compatibility - though firmware must be updated to support MRAM-specific commands and timing.

What is the data retention specification for M10042040054X0PSAR at its maximum operating temperature?

M10042040054X0PSAR guarantees >20 years of data retention at +105°C, as stated in the "Features" section and validated per JEDEC JESD22-A117 reliability testing. This exceeds typical flash retention (10–15 years at 85°C) and ensures long-term integrity for applications like smart metering and medical diagnostics where field service intervals exceed a decade.